Bug 619632

Summary:	CVE-2017-7494: Samba: Remote code execution from a writable share.
Product:	Gentoo Security	Reporter:	John R. Graham <john_r_graham>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED DUPLICATE
Severity:	critical
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description John R. Graham gentoo-dev

2017-05-25 02:54:25 UTC

See https://www.samba.org/samba/security/CVE-2017-7494.html

==========
Description
===========

All versions of Samba from 3.5.0 onwards are vulnerable to a remote
code execution vulnerability, allowing a malicious client to upload a
shared library to a writable share, and then cause the server to load
and execute it.

==================
Patch Availability
==================

A patch addressing this defect has been posted to

  http://www.samba.org/samba/security/

Additionally, Samba 4.6.4, 4.5.10 and 4.4.14 have been issued as
security releases to correct the defect. Patches against older Samba
versions are available at http://samba.org/samba/patches/. Samba
vendors and administrators running affected versions are advised to
upgrade or apply the patch as soon as possible.

==========
Workaround
==========

Add the parameter:

nt pipe support = no

to the [global] section of your smb.conf and restart smbd. This
prevents clients from accessing any named pipe endpoints. Note this
can disable some expected functionality for Windows clients.

=======
Credits
=======

This problem was found by steelo <knownsteelo@gmail.com>. Volker
Lendecke of SerNet and the Samba Team provided the fix.

Comment 1 John R. Graham gentoo-dev

2017-05-25 03:13:55 UTC


*** This bug has been marked as a duplicate of bug 619516 ***